Really nice tips for 2d artists. I admire the way how David inspires lot of people. me included. So have a nice end of year and rest to start 2016 with lot of energy. In technical side you always give nice tips with blender ,easy to follow.

@Alica : Hey, to import a Blender render in Krita, you need to render the Blender project as a image and save it on your disk as *.PNG for example. Saving a render as image is a common option on the rendered image viewer in Blender. Then you can transform the white of the rendered picture in transparant with the filter Color>Color to alpha.

@Alica
The lines are rendered, or in other words an image is calculated based on what is in the scene and what the camera sees. Render settings are in step 6.

Once the render is done, you have to save the image separately because it's just one frame (animations go in the output folder specified in render properties -> output). You can save the rendered image from the image menu -> save image as (or press F3), the dialog also has format options on the left.

As a small tip, I found an interesting add-on for Blender that can calculate and set the camera focal length and rotation if the drawing is in 2 point perspective. It is called BLAM (https://github.com/stuffmatic/blam) and can really make it a breeze to insert 3D objects into drawings. I am currently using it with "Manuel Bastioni Lab" (http://www.manuelbastioni.com) to get some proportionally correct humanoids into my drawings (wip: http://imgur.com/6OSWheb) and I thought I'd share it because I find it really helpful.